Cable resistance determination in high-power PoE networks
First Claim
1. A power sourcing equipment (PSE) for determining a resistance of a powered cable, said PSE comprising:
- a first supply voltage to cause a first current to flow through first and second output terminals of said PSE;
a second supply voltage to cause a second current to flow through third and fourth output terminals of said PSE;
a current modulation circuit offsetting said second current from said first current to create an offset voltage between said second and said first supply voltages to determine said resistance of said powered cable.
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Accused Products
Abstract
An exemplary implementation of the present disclosure is a power sourcing equipment (PSE) for determining a resistance of a powered cable. The PSE includes a first supply voltage to cause a first current to flow through first and second output terminals of the PSE. The PSE also includes a second supply voltage to cause a second current to flow through third and fourth output terminals of the PSE. The PSE further includes a current modulation circuit offsetting the second current from the first current to create an offset voltage between the second and the first supply voltages to determine the resistance of the powered cable. The current modulation circuit can offset the second current from the first current utilizing a variable resistance switch to adjust the second current.
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Citations
20 Claims
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1. A power sourcing equipment (PSE) for determining a resistance of a powered cable, said PSE comprising:
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a first supply voltage to cause a first current to flow through first and second output terminals of said PSE; a second supply voltage to cause a second current to flow through third and fourth output terminals of said PSE; a current modulation circuit offsetting said second current from said first current to create an offset voltage between said second and said first supply voltages to determine said resistance of said powered cable. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining a resistance of a powered cable utilized by a power sourcing equipment (PSE) in a Power over Ethernet (PoE) network, the method comprising:
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applying a first supply voltage to cause a first current to flow through first and second output terminals of said PSE; applying a second supply voltage to cause a second current to flow through third and fourth output terminals of said PSE; offsetting said second current from said first current to create an offset voltage between said second and said first supply voltages to determine said resistance of said powered cable. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for determining a resistance of a powered cable, the system comprising:
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a powered device; a PSE applying a first supply voltage to said powered device over said powered cable and causing a first current to flow through first and second conductive pairs in said powered cable; said PSE applying a second supply voltage to said powered device over said powered cable and causing a second current to flow through third and fourth conductive pairs in said powered cable; a current modulation circuit offsetting said second current from said first current to create an offset voltage between said second and said first supply voltages to determine said resistance of said powered cable. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification